A well-ventilated greenhouse helps manage heat, humidity, and stagnant air so plants can grow in a more stable environment. The right exhaust fan can also reduce condensation and improve comfort during hot weather.
We compared 10 exhaust greenhouse fans across airflow, controls, installation style, motor efficiency, and coverage claims to help you choose a practical match for your growing space.
Best 10 Exhaust Greenhouse Fans Picks for 2026
Best High-Capacity Pick
iLIVING 20-Inch Variable-Speed Exhaust Fan
- 3,368 CFM airflow
- Thermostat and variable-speed control
- Rated for up to 5,000 square feet
Best For: Large greenhouses and high-volume ventilation
Best Energy-Saving Option
Amico 12-Inch Smart Thermostat Fan
- 1,282 CFM airflow
- Eight speeds with thermostat automation
- 25W DC motor and 50 dB operation
Best For: Small to medium spaces needing quiet, efficient ventilation
Best Simple High-Airflow Pick
- 3,500 CFM airflow
- Automatic aluminum shutters
- Plug-in setup with 1.65-meter cord
Best For: Large spaces needing simple, powerful exhaust
Best Mid-Size Controlled Option
iLIVING 18-Inch Variable-Speed Fan
- 1,736 CFM airflow
- Thermostat and variable-speed control
- Rated for up to 2,600 square feet
Best For: Medium greenhouses needing adjustable ventilation
Best for Easy Setup
VEVOR 14-Inch Variable-Speed Shutter Fan
- 1,802 CFM airflow for rapid ventilation
- Stepless speed control included
- Steel housing with automatic rain-blocking shutters
Best For: Large greenhouses and high-airflow ventilation
Thermostat-Controlled Choice
iLiving 12-Inch Shutter Exhaust Fan
- 960 CFM airflow with 1,400-square-foot coverage
- Thermostat range from 32 to 130°F
- Galvanized steel frame with UL/cUL listing
Best For: Medium spaces needing temperature-based ventilation
Efficient Compact Pick
Hon&Guan 10-Inch Stepless Shutter Fan
- 647 CFM airflow at 33 watts
- Stepless speed controller included
- Gravity shutters and plug-and-play installation
Best For: Smaller greenhouses seeking adjustable, efficient airflow
Best Budget Pick
VEVOR 10-Inch 820 CFM Exhaust Fan
- 820 CFM airflow in a compact 10-inch size
- Galvanized steel and aluminum construction
- Requires separate plug and wiring
Best For: Small greenhouses and basic wall ventilation
Best Smart Controls
iLIVING 12-Inch Variable-Speed Exhaust Fan
- 960 CFM airflow for spaces up to 1,400 square feet
- Up to 12 speeds with temperature and humidity triggers
- Includes power cord for plug-and-play installation
Best For: Greenhouses needing automated climate control
Highest Airflow
VEVOR 12-Inch 1500 CFM Smart Exhaust Fan
- High-capacity 1500 CFM airflow
- 10 speeds with temperature and humidity triggers
- Automatic shutters help block rain when off
Best For: Large greenhouses needing rapid, high-volume ventilation
Best High-Capacity Pick – iLIVING 20-Inch Variable-Speed Exhaust Fan
For large greenhouses and other sizable spaces, this iLIVING model is one of the more powerful exhaust greenhouse fans in the lineup. It delivers 3,368 CFM, includes a thermostat and variable-speed controller, and is rated to cover up to 5,000 square feet.
Best For: Large greenhouses, workshops, garages, and warehouses needing adjustable, high-volume ventilation.
Pros:
- High 3,368 CFM airflow with coverage rated up to 5,000 square feet
- Thermostat control and variable-speed adjustment
- Galvanized steel frame, aluminum shutters and blades, and OSHA-compliant wire guards
- UL/cUL listed direct-drive motor
Cons:
- At 69 dB, it may be relatively noticeable in sound-sensitive areas
- The 20-inch wall-mounted design requires a suitably sized installation location
- Includes a one-year limited component warranty
Choose this fan when maximum airflow and automatic temperature control matter more than compact size or quieter operation. Its industrial construction also makes it a practical option for humid greenhouse environments.
Best Energy-Saving Option – Amico 12-Inch Smart Thermostat Fan
The Amico 12-inch fan is a flexible choice among exhaust greenhouse fans when you want automatic temperature control without using a large AC motor. Its brushless DC motor, eight speeds, and plug-and-play setup make it easy to tailor ventilation to changing greenhouse conditions.
Best For: Small to medium greenhouses, sheds, garages, and other spaces where efficiency and quiet operation are priorities.
Pros:
- 1,282 CFM airflow with coverage advertised up to 1,600 square feet
- Eight speeds, thermostat-triggered operation, and power-off memory
- 25W brushless DC motor with a stated 50 dB operating noise level
- Automatic gravity shutters help block drafts, rain, and insects when off
Cons:
- Lower airflow than the larger 18- and 20-inch models in this selection
- A 12-inch fan may not be sufficient for very large greenhouse spaces
- Thermostat probe uses a 3-foot wire, which may limit placement flexibility
This is a strong fit for growers who want more precise adjustment and lower stated power consumption. The pre-wired plug and extra-long power cord can also simplify installation compared with hardwired ventilation systems.
Best Simple High-Airflow Pick – KEN BROWN 20-Inch Shutter Fan
For straightforward ventilation, the KEN BROWN 20-inch model provides 3,500 CFM without the added complexity of a thermostat or multi-speed controller. It is a practical exhaust greenhouse fan for removing heat, moisture, dust, and odors from larger agricultural or workshop spaces.
Best For: Large greenhouses, barns, shops, attics, and other areas that need strong, uncomplicated exhaust airflow.
Pros:
- Highest stated airflow in this roundup at 3,500 CFM
- Automatic aluminum gravity shutters open and close with fan operation
- Corrosion-resistant aluminum shutters and blades
- Pre-installed 1.65-meter power cord supports plug-and-use installation
Cons:
- Only one speed is listed, so airflow cannot be finely adjusted
- No thermostat control is included
- Coverage area is not specified in the supplied product details
This fan makes sense when raw airflow and simple operation are the main priorities. Its single-speed design is less adaptable than thermostatic models, but the plug-in setup and automatic shutters keep daily use uncomplicated.
Best Mid-Size Controlled Option – iLIVING 18-Inch Variable-Speed Fan
This 18-inch iLIVING model balances substantial airflow with a more compact footprint than the 20-inch fans. As exhaust greenhouse fans go, it stands out for combining 1,736 CFM airflow, thermostat control, and variable-speed adjustment in a wall-mounted design rated for up to 2,600 square feet.
Best For: Medium-size greenhouses, garages, workshops, and warehouses needing adjustable ventilation in a moderate-size wall opening.
Pros:
- 1,736 CFM airflow with coverage rated up to 2,600 square feet
- Thermostat range from 32 to 130°F and variable-speed control
- Galvanized steel frame with aluminum shutters and blades
- UL/cUL listed and rated below 65 dB
Cons:
- Only three speeds are listed
- Airflow is lower than the larger 20-inch models
- Includes a one-year limited component warranty
Consider this model when a greenhouse needs more ventilation than a compact fan can provide but does not require the maximum output of a 20-inch unit. Its thermostat and speed controls offer useful flexibility for managing changing temperatures.
Best for Easy Setup – VEVOR 14-Inch Variable-Speed Shutter Fan
For larger greenhouses and other demanding spaces, this VEVOR model is one of the higher-airflow exhaust greenhouse fans in this lineup. Its 1,802 CFM output, steel housing, variable-speed control, and automatic shutters make it suitable for quickly clearing heat, odors, stale air, and floating dirt.
Best For: Larger greenhouses, barns, garages, workshops, and spaces that need powerful adjustable ventilation.
Pros:
- High 1,802 CFM airflow for rapid heat and stale-air removal.
- Stepless speed control allows airflow adjustments from gentle circulation to maximum ventilation.
- Steel housing and rain-blocking shutters offer a durable wall-mounted design.
- AC motor runs at 1,600 RPM with stated low-noise operation.
Cons:
- Its 63 dB noise rating may be noticeable in quieter spaces.
- The larger 14-inch format may require more wall space and a suitable opening.
- Designed for indoor use in the supplied specifications, so installation conditions should be checked carefully.
The VEVOR is the strongest choice here when maximum airflow is the priority. Its adjustable controller adds flexibility, while the metal enclosure and closing shutters support use in demanding ventilation setups.
Thermostat-Controlled Choice – iLiving 12-Inch Shutter Exhaust Fan
The iLiving 12-inch fan is a practical option among exhaust greenhouse fans when automatic temperature management matters. It combines 960 CFM airflow with a thermostat and variable-speed controller, allowing ventilation to respond to temperature needs across spaces up to 1,400 square feet.
Best For: Greenhouses, workshops, garages, and other spaces where temperature and fan-speed control are useful.
Pros:
- Thermospeed controller provides variable-speed and temperature regulation from 32 to 130°F.
- 960 CFM airflow is rated for coverage up to 1,400 square feet.
- Galvanized steel frame, aluminum shutters, and aluminum blades are designed for durability and corrosion resistance.
- UL/cUL listed with a permanently lubricated direct-drive motor.
Cons:
- Its 65 dB noise rating may not suit noise-sensitive installations.
- At 960 CFM, it provides less airflow than the larger VEVOR model.
- The supplied specification lists three speeds, so it may offer less fine adjustment than a truly stepless controller.
The iLiving stands out for its integrated thermostat functionality. Choose it when maintaining a temperature range is more important than maximizing airflow, especially in a medium-sized greenhouse or utility space.
Efficient Compact Pick – Hon&Guan 10-Inch Stepless Shutter Fan
For smaller greenhouses, the Hon&Guan offers a compact way to add adjustable exhaust ventilation without the higher power draw of larger models. This 10-inch wall fan delivers 647 CFM at 33 watts and includes a stepless controller, automatic gravity shutters, and installation hardware.
Best For: Smaller greenhouses, sheds, garages, and spaces where lower energy use and precise airflow adjustment are priorities.
Pros:
- 647 CFM airflow with a relatively low 33-watt power requirement.
- Stepless controller enables precise airflow adjustments without abrupt speed changes.
- Gravity-closing shutters help block rain, dust, insects, and debris when the fan is off.
- Includes an 8-foot power cord, US plug, and wall-installation hardware.
Cons:
- Its 647 CFM output is better suited to smaller areas than large greenhouses.
- The 10-inch fan requires a 10.75-by-10.75-inch opening, which should be verified before installation.
- The supplied notes identify manual controls rather than thermostat-based operation.
The Hon&Guan is a sensible fit when you want controllable ventilation in a smaller footprint. Its low stated wattage, plug-and-play accessories, and protective gravity shutters make it convenient for routine greenhouse airflow management.
Best Budget Pick – VEVOR 10-Inch 820 CFM Exhaust Fan
For shoppers seeking practical exhaust greenhouse fans on a budget, this VEVOR model offers 820 CFM of airflow in a compact 10-inch wall-mounted design. Its galvanized steel frame, aluminum components, and automatic shutter suit greenhouse, shed, workshop, and attic ventilation, though installation requires separate wiring.
Best For: Small greenhouses and enclosed areas needing straightforward, high-airflow exhaust.
Pros:
- Moves up to 820 CFM while using 45 watts.
- Rust-resistant galvanized steel and aluminum construction.
- Automatic shutter helps protect the opening when the fan is off.
- Thermally protected, permanently lubricated motor is designed for low maintenance.
Cons:
- Basic one-speed design without a speed control switch.
- Plug is not included and must be purchased and wired separately.
- Lower airflow than the larger 12-inch models in this roundup.
This is a sensible choice when you want dependable mechanical ventilation without advanced controls. Confirm that the separate plug and wall-opening installation fit your setup before buying.
Best Smart Controls – iLIVING 12-Inch Variable-Speed Exhaust Fan
The iLIVING 12-inch is one of the more versatile exhaust greenhouse fans for growers who want automated ventilation. Its digital controller offers temperature and humidity triggers, up to 12 speeds, and a 24-hour timer, while the included power cord supports a simpler plug-and-play setup.
Best For: Greenhouses where temperature and humidity changes call for automatic airflow adjustments.
Pros:
- Provides 960 CFM of airflow for spaces up to 1,400 square feet.
- Offers 12 speed settings plus temperature and humidity control.
- Includes a 5.6-foot power cord for easier installation.
- ETL-certified EC motor and corrosion-resistant metal construction.
Cons:
- Its 53 dB noise rating is higher than a very quiet residential fan.
- USB control-wire extension is not included.
- Larger wall opening is required than for the 10-inch model.
Choose this model if automated climate response matters more than the simplest possible controls. It balances useful greenhouse programming with a manageable 12-inch wall-mounted format.
Highest Airflow – VEVOR 12-Inch 1500 CFM Smart Exhaust Fan
For larger spaces or fast heat and moisture removal, this VEVOR model delivers the highest rated airflow among these exhaust greenhouse fans at 1,500 CFM. Its smart controller supports temperature and humidity triggers, while the EC motor and closing shutters add efficiency and weather protection to a heavy-duty wall-mounted setup.
Best For: Larger greenhouses and demanding ventilation jobs that benefit from maximum airflow.
Pros:
- 1500 CFM airflow rapidly expels heat, odors, dirt, and stale air.
- Controller provides up to 10 speeds, automatic triggers, timer, and alarm modes.
- All-metal construction is designed to handle damp conditions and rain.
- Automatic shutters close when powered off to help block rain and small debris.
Cons:
- Listed noise level is 67 dB, making it the loudest option here.
- Uses a 240-volt specification, so electrical compatibility should be confirmed.
- Its higher airflow may be excessive for small greenhouse spaces.
This is the strongest fit when ventilation capacity is the priority. Before ordering, verify the 240-volt requirement, available wall space, and whether the 67 dB operating level suits your greenhouse location.
How We Picked the Best Exhaust Greenhouse Fans
We focused on wall-mounted shutter fans suited to greenhouses and similar spaces such as grow rooms, garages, sheds, and workshops. The comparison considers advertised airflow, fan size, control options, coverage guidance, motor design, shutter operation, and installation convenience. Because real performance depends on ducting, obstructions, temperature, and greenhouse layout, treat square-foot ratings as starting points rather than guarantees.
Models with thermostats or temperature-and-humidity controls received extra attention because automated ventilation can maintain more consistent conditions than manually switching a fan on and off. We also included several speed-controlled options so you can reduce airflow when full power is unnecessary.
Quick Comparison
- Small spaces: 10-inch models generally offer the simplest installation and lower airflow for compact greenhouses.
- Medium spaces: 12- to 14-inch fans provide a useful balance of airflow, control, and energy use.
- Larger spaces: 18- and 20-inch fans move substantially more air and are better suited to large structures or demanding heat loads.
- Best automation: Look for thermostat or combined temperature-and-humidity controls.
- Best flexibility: Variable or stepless speed control lets you fine-tune ventilation instead of relying on one fixed output.
Key Buying Factors for Exhaust Greenhouse Fans
Airflow and Greenhouse Size
CFM, or cubic feet per minute, indicates how much air a fan can move. A larger greenhouse, hotter climate, or denser plant canopy usually requires more airflow. Measure the installation opening and compare it with the fan’s stated dimensions before buying.
Thermostat and Humidity Controls
A thermostat can start ventilation when temperatures rise, while humidity control can help respond to damp conditions. These features are especially useful if you cannot monitor the greenhouse frequently. Check whether the controller is included and how its settings are adjusted.
Shutters, Louvers, and Installation
Automatic shutters or gravity louvers help limit drafts, debris, and unwanted air exchange when the fan is off. Confirm wall thickness, clearance, power-cord length, mounting hardware, and whether electrical work requires a qualified professional.
Noise, Power, and Weather Exposure
Higher airflow can mean more operating noise and electricity use. Choose a variable-speed model if you want quieter day-to-day operation. Install the fan where it is protected from direct rain unless the manufacturer specifically approves exposed outdoor use.
Who Should Buy Which Exhaust Greenhouse Fans?
Choose a 10-inch fan for a compact greenhouse or supplemental ventilation. A 12-inch model is a practical general-purpose choice for many small and medium structures. Consider a 14-inch fan when you need more airflow without moving to a full-size installation. For large greenhouses, very hot climates, or heavily planted spaces, an 18- or 20-inch model may provide better air exchange.
Buy a temperature-and-humidity-controlled fan if automation is your priority. Choose a variable-speed model when quiet operation and precise adjustment matter most. Before ordering, verify the actual opening dimensions, available electrical supply, control compatibility, and the manufacturer’s installation instructions.